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Difference Between Two LocalDateTime in Java - Java 147

Difference Between Two LocalDateTime in Java – Java 147

Difference Between Two LocalDateTime in Java

計算兩個日期時間差距，有幾種方法可以找到不同時間單位，取得兩者之前的差異，提供了一些常見的方法，例如： Duration 、 ChronoUnit 、 until 等方式， Calculate Difference Between Two LocalDateTime 屬於 java.time 套件，日期和時間相關的 API ，本篇增加了範例，並透過單元測試來驗證產出結果。

檔案目錄

./
   +- src
       +- test
       |   +- org
       |       +- ruoxue
       |           +- java_147
       |               +- datetime
       |                   +- localdatetime
       |                       +- DifferenceTwoLocalDateTimeTest.java

單元測試

Java Time Between Two LocalDateTime 計算兩個 LocalDateTime 物件的差異。

Duration_between

Java Time Between Two LocalDateTime 建立兩個 LocalDateTime ，使用 Duration between 靜態方法，可以採用不同的時間單位，計算兩者之間的差異。

	@Test
	public void Duration_between() {
		LocalDateTime localDateTime = LocalDateTime.of(2023, 8, 3, 1, 2, 3, 123456789);
		LocalDateTime localDateTime2 = LocalDateTime.of(2024, 8, 3, 1, 2, 3, 123456789);
		Duration duration = Duration.between(localDateTime, localDateTime2);
		System.out.println(duration);

		long days = duration.toDays();
		System.out.println(days);
		assertThat(days).isEqualTo(366);

		long hours = duration.toHours();
		System.out.println(hours);
		assertThat(hours).isEqualTo(8784);

		long minutes = duration.toMinutes();
		System.out.println(minutes);
		assertThat(minutes).isEqualTo(527040);

		long seconds = duration.getSeconds();
		System.out.println(seconds);
		assertThat(seconds).isEqualTo(31622400);

		long nanos = duration.toNanos();
		System.out.println(nanos);
		assertThat(nanos).isEqualTo(31622400000000000L);
	}
PT8784H
366
8784
527040
31622400
31622400000000000

ChronoUnit_between

Java Time Between Two LocalDateTime 建立兩個 LocalDateTime ，使用 ChronoUnit Enum ，可以採用不同的時間單位，計算兩者之間的差異。

	@Test
	public void ChronoUnit_between() {
		LocalDateTime localDateTime = LocalDateTime.of(2023, 8, 3, 1, 2, 3, 123456789);
		LocalDateTime localDateTime2 = LocalDateTime.of(2024, 8, 3, 1, 2, 3, 123456789);

		long years = ChronoUnit.YEARS.between(localDateTime, localDateTime2);
		System.out.println(years);
		assertThat(years).isEqualTo(1);

		long months = ChronoUnit.MONTHS.between(localDateTime, localDateTime2);
		System.out.println(months);
		assertThat(months).isEqualTo(12);

		long weeks = ChronoUnit.WEEKS.between(localDateTime, localDateTime2);
		System.out.println(weeks);
		assertThat(weeks).isEqualTo(52);

		long days = ChronoUnit.DAYS.between(localDateTime, localDateTime2);
		System.out.println(days);
		assertThat(days).isEqualTo(366);

		long hours = ChronoUnit.HOURS.between(localDateTime, localDateTime2);
		System.out.println(hours);
		assertThat(hours).isEqualTo(8784);

		long minutes = ChronoUnit.MINUTES.between(localDateTime, localDateTime2);
		System.out.println(minutes);
		assertThat(minutes).isEqualTo(527040);

		long seconds = ChronoUnit.SECONDS.between(localDateTime, localDateTime2);
		System.out.println(seconds);
		assertThat(seconds).isEqualTo(31622400);

		long milliseconds = ChronoUnit.MILLIS.between(localDateTime, localDateTime2);
		System.out.println(milliseconds);
		assertThat(milliseconds).isEqualTo(31622400000L);

		long nano = ChronoUnit.NANOS.between(localDateTime, localDateTime2);
		System.out.println(nano);
		assertThat(nano).isEqualTo(31622400000000000L);
	}
1
12
52
366
8784
527040
31622400
31622400000
31622400000000000

until

Java Time Between Two LocalDateTime 建立兩個 LocalDateTime ，可以採用不同的時間單位，計算兩者之間的差異， Java LocalDateTime Difference Between Two Dates 提供範例參考。

	@Test
	public void until() {
		LocalDateTime localDateTime = LocalDateTime.of(2023, 8, 3, 1, 2, 3, 123456789);
		LocalDateTime localDateTime2 = LocalDateTime.of(2024, 8, 3, 1, 2, 3, 987654321);

		long years = localDateTime.until(localDateTime2, ChronoUnit.YEARS);
		System.out.println(years);
		assertThat(years).isEqualTo(1);

		long months = localDateTime.until(localDateTime2, ChronoUnit.MONTHS);
		System.out.println(months);
		assertThat(months).isEqualTo(12);

		long weeks = localDateTime.until(localDateTime2, ChronoUnit.WEEKS);
		System.out.println(weeks);
		assertThat(weeks).isEqualTo(52);

		long days = localDateTime.until(localDateTime2, ChronoUnit.DAYS);
		System.out.println(days);
		assertThat(days).isEqualTo(366);

		long hours = localDateTime.until(localDateTime2, ChronoUnit.HOURS);
		System.out.println(hours);
		assertThat(hours).isEqualTo(8784);

		long minutes = localDateTime.until(localDateTime2, ChronoUnit.MINUTES);
		System.out.println(minutes);
		assertThat(minutes).isEqualTo(527040);

		long seconds = localDateTime.until(localDateTime2, ChronoUnit.SECONDS);
		System.out.println(seconds);
		assertThat(seconds).isEqualTo(31622400);

		long milliseconds = localDateTime.until(localDateTime2, ChronoUnit.MILLIS);
		System.out.println(milliseconds);
		assertThat(milliseconds).isEqualTo(31622400864L);

		long nano = localDateTime.until(localDateTime2, ChronoUnit.NANOS);
		System.out.println(nano);
		assertThat(nano).isEqualTo(31622400864197532L);
	}
1
12
52
366
8784
527040
31622400
31622400864
31622400864197532

DifferenceTwoLocalDateTimeTest.java

Difference Between Two LocalDateTime in Multiple Units 新增單元測試，驗證 Java LocalDateTime Difference Between Two Dates 是否符合預期。

package org.ruoxue.java_147.datetime.localdatetime;

import static org.assertj.core.api.Assertions.assertThat;

import java.time.Duration;
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;

import org.junit.Test;

public class DifferenceTwoLocalDateTimeTest {

	@Test
	public void Duration_between() {
		LocalDateTime localDateTime = LocalDateTime.of(2023, 8, 3, 1, 2, 3, 123456789);
		LocalDateTime localDateTime2 = LocalDateTime.of(2024, 8, 3, 1, 2, 3, 123456789);
		Duration duration = Duration.between(localDateTime, localDateTime2);
		System.out.println(duration);

		long days = duration.toDays();
		System.out.println(days);
		assertThat(days).isEqualTo(366);

		long hours = duration.toHours();
		System.out.println(hours);
		assertThat(hours).isEqualTo(8784);

		long minutes = duration.toMinutes();
		System.out.println(minutes);
		assertThat(minutes).isEqualTo(527040);

		long seconds = duration.getSeconds();
		System.out.println(seconds);
		assertThat(seconds).isEqualTo(31622400);

		long nanos = duration.toNanos();
		System.out.println(nanos);
		assertThat(nanos).isEqualTo(31622400000000000L);
	}

	@Test
	public void ChronoUnit_between() {
		LocalDateTime localDateTime = LocalDateTime.of(2023, 8, 3, 1, 2, 3, 123456789);
		LocalDateTime localDateTime2 = LocalDateTime.of(2024, 8, 3, 1, 2, 3, 123456789);

		long years = ChronoUnit.YEARS.between(localDateTime, localDateTime2);
		System.out.println(years);
		assertThat(years).isEqualTo(1);

		long months = ChronoUnit.MONTHS.between(localDateTime, localDateTime2);
		System.out.println(months);
		assertThat(months).isEqualTo(12);

		long weeks = ChronoUnit.WEEKS.between(localDateTime, localDateTime2);
		System.out.println(weeks);
		assertThat(weeks).isEqualTo(52);

		long days = ChronoUnit.DAYS.between(localDateTime, localDateTime2);
		System.out.println(days);
		assertThat(days).isEqualTo(366);

		long hours = ChronoUnit.HOURS.between(localDateTime, localDateTime2);
		System.out.println(hours);
		assertThat(hours).isEqualTo(8784);

		long minutes = ChronoUnit.MINUTES.between(localDateTime, localDateTime2);
		System.out.println(minutes);
		assertThat(minutes).isEqualTo(527040);

		long seconds = ChronoUnit.SECONDS.between(localDateTime, localDateTime2);
		System.out.println(seconds);
		assertThat(seconds).isEqualTo(31622400);

		long milliseconds = ChronoUnit.MILLIS.between(localDateTime, localDateTime2);
		System.out.println(milliseconds);
		assertThat(milliseconds).isEqualTo(31622400000L);

		long nano = ChronoUnit.NANOS.between(localDateTime, localDateTime2);
		System.out.println(nano);
		assertThat(nano).isEqualTo(31622400000000000L);
	}

	@Test
	public void until() {
		LocalDateTime localDateTime = LocalDateTime.of(2023, 8, 3, 1, 2, 3, 123456789);
		LocalDateTime localDateTime2 = LocalDateTime.of(2024, 8, 3, 1, 2, 3, 987654321);

		long years = localDateTime.until(localDateTime2, ChronoUnit.YEARS);
		System.out.println(years);
		assertThat(years).isEqualTo(1);

		long months = localDateTime.until(localDateTime2, ChronoUnit.MONTHS);
		System.out.println(months);
		assertThat(months).isEqualTo(12);

		long weeks = localDateTime.until(localDateTime2, ChronoUnit.WEEKS);
		System.out.println(weeks);
		assertThat(weeks).isEqualTo(52);

		long days = localDateTime.until(localDateTime2, ChronoUnit.DAYS);
		System.out.println(days);
		assertThat(days).isEqualTo(366);

		long hours = localDateTime.until(localDateTime2, ChronoUnit.HOURS);
		System.out.println(hours);
		assertThat(hours).isEqualTo(8784);

		long minutes = localDateTime.until(localDateTime2, ChronoUnit.MINUTES);
		System.out.println(minutes);
		assertThat(minutes).isEqualTo(527040);

		long seconds = localDateTime.until(localDateTime2, ChronoUnit.SECONDS);
		System.out.println(seconds);
		assertThat(seconds).isEqualTo(31622400);

		long milliseconds = localDateTime.until(localDateTime2, ChronoUnit.MILLIS);
		System.out.println(milliseconds);
		assertThat(milliseconds).isEqualTo(31622400864L);

		long nano = localDateTime.until(localDateTime2, ChronoUnit.NANOS);
		System.out.println(nano);
		assertThat(nano).isEqualTo(31622400864197532L);
	}
}

心得分享

Java LocalDateTime Difference Between Two Dates 計算日期時間，提供不同的時間單位，取得其差異，對日期時間進行運算更加方便，熟悉 Difference Between Two LocalDateTime in Multiple Units 這些方法的操作，提升開發效率，在應用上相當廣泛。

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